Macfarlane



`G. T. MACFARLANE,

WlNCH.

APPLIcAloN man MAY 22.1911,

Geenen Tnomasmicmanana, er Pimina', ENGLAND.

' WINCH.

f Application filed May 22.

To all 'whdm #may concern.'

Be it known that I, GEORGE THOMAS MAcrARLANmasubject of the King-of Great Britain and Ireland, residing at innen in dlin the county of Middlesex, England, have 4`invented Improvements in Winches, of which the followlng is a specification.

This invention relates to winches and has for object toy provide a winch particularly suitablefor use as a ships-winch for hancargv quickly and..witl1out undue shoc overhaulingof the winch -barrel being eifectedrapidly and'det'rilnental heati mg Iand-wear of the brake devices being avoided.

' In'a winch according to the invention, thc barrel, or each barrel, is freely mounted on the driving shaft and is rotated therefrom,

through epicycli-c gearicontrolled by brake' drums furnished with band brakes and to prevent the barrel or to prevent each barrel, when rotating in ai lowering direction, acquiring too high a speed under the action of gravity, and, to reduce the necessity for employing the brake, so much as'. would otherwise be the case the barrel, as by a free wheel clutch or thelike device, is caused to directly or indirectly engage the driving shaft upon the rateof barrel rotation overtaking the rate of rotation of the driving shaft, the engine thereupon. actingas a brake'. In some cases tliefifeeVv lwheel or like device connecting the barreltol the drivingv shaft may be such that thebarrel and shaft come into engagement when the ba rel ro taies at a predetermined speed ess' or greaterthan that of the shaft.

A s the barrels of `amulti-barrel winch embodying .the invention are all similar it is sufficient to describe the invention in connection with one barrel only.

In the accompanying drawings Figure' 1 shows'. in central verticalsection a winch barrel embodyin the invention.

Fig. 2 is an en' view of the winch barrel.

The barrel o is freely mounted on the drivingsslafttb' and is driven in ajhoist` ing direction through epicyclic arcomppsing a brake drum d provi ed internelly with a ring. of teeth @engaged .by planet inions f secured to another a jacent rake rum g, it bei understood that the barrel a is attached to the internally toothed -drum d andthat the driving shaft b has a Specification of Letters Patent.

Patented Dec. 2', 1919.

1917. serial' No. 170.1423.

sun wheel )L engaging theplanet pinions The inner ends of the planet pinion spindles i are carried in a disk mounted to rotate on the boss of the sun wheel l1. The end of the barrel remote from the epicyclic gear.

ing, the bur-rel (l and driving shaftI i; rotate in opposite directions and the pawls o shp idly over the ratchet wheel p, but during lowering. the barrel c1. and driving shaft'b rotate 11i the same dlrect-ion and the pawls 0 enga ge the teeth of the ratchet wheel p. upon the rate of rotation ofthe drum a overtaking that of the driving shaft b, the engine, whichin the case of an electric winch may be at shunt-wound motor, then acting as a brake. By these means the work usually taken by the ordin'ary brakes is or can be much reduced with corresponding prevention of overheating. The pawls may ifdesired he constructed and arranged so that thev may bc put out of action at will.

the case of an electrically driven winch the connection of the barrel a to the shaft b when lowering may result in the motor being caused to generate electricity .which may be utilized in the system with economical results.

Annular aices 7 on .the adjacent faces of g2 for the purpose of overhauling. When so engaged with each other, the two drums will revolve together if the brake bands of both drums be released, the drum d, which normally rotates in a direction opposite to that of the shaft b when the drum g is stationary, being then driven in' the reverse direction. i

As will be understood details of construe?, tion of the improved winch may be varied without departure from the invention.

What I claim is:

1. In a winch; a, drivi shaft rotated in one direction only, a hoisting barrel, adapted to rotate freely on sa'id shaft in a lowering direction, and means for automatically algaging 'snaitamiivah-snazshaa5vpen said barrel" rotates in a lowerrgxfdtioh at the desired llimit ofspeed.

In a' winch, a driving shaft, a hoistii barrel, adapted to rotate freely on sai shaft in a'lowering direction, and a ratehet device for connecting said barrel to said shaft when said barrel rotates in a lowering l-j direction at a speed corresponding to that of said shaft.

3. In a winch, -a driving shaft, a holstlng' I barrel 'freely mounted on said shaft, epieyc-l lie gearing whereby said barrel is driven by said shaft, and means for automatically conneletingsaid barrel -iso-said shaft`when said barrelJ rotates in a lowering direction at a speedj'eorresponding to that of said shaft.

-1.111 a Winch, a driving shaft, a hoisting barrel freely mounted on said shaft, Iepicyeliegearing whereby Said barrel is dniven by said shaft, pawls pivoted to said barrel, and af ratchet wheel fixed' to said shaft and C adapted to'be enga d 'by said pawls.`

- 5.t:In a w1neh,a. iving shaft, a hoisting barrel freely. mounted on said shaft, a, b ake drlnnhaving an internal ring of teeth xed' mneenl of harreha plain brake drum fixed tothe other end of said barrel, a sun wheel fixed .to said shaft, planet pinions gearing into said sun wlheel and into the ring of teeth olf said internally toothed drum, a brake drum carrying said pinions,

fixed' tothe other end of said barrel, a sun wheel xed to said shaft, planet pinions gearing into, said sun Wheel and into the.

ring of teeth of said internally toothed drum, a brake drum carrying said pinions, means' for moving 'said pinion carrying AAbrake drum. into frietional engagement with said brake drinn having an internal ring of teeth, pawls pivoted to said plainv bra-ke d-rum,.and a ratchet wheel fixed to said4 shaft and adapted to lb e engaged by said pawls. l

Signed at London, England, this 8th dayy of March 1917. I

' Groer. axioms nommant.. 

